distribution/docs/handlers/blob.go
Richard 390bb97a88 Manifest and layer soft deletion.
Implement the delete API by implementing soft delete for layers
and blobs by removing link files and updating the blob descriptor
cache.  Deletion is configurable - if it is disabled API calls
will return an unsupported error.

We invalidate the blob descriptor cache by changing the linkedBlobStore's
blobStatter to a blobDescriptorService and naming it blobAccessController.

Delete() is added throughout the relevant API to support this functionality.

Signed-off-by: Richard Scothern <richard.scothern@gmail.com>
2015-07-24 09:57:20 -07:00

93 lines
2.6 KiB
Go

package handlers
import (
"net/http"
"github.com/docker/distribution"
"github.com/docker/distribution/context"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/registry/api/errcode"
"github.com/docker/distribution/registry/api/v2"
"github.com/gorilla/handlers"
)
// blobDispatcher uses the request context to build a blobHandler.
func blobDispatcher(ctx *Context, r *http.Request) http.Handler {
dgst, err := getDigest(ctx)
if err != nil {
if err == errDigestNotAvailable {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx.Errors = append(ctx.Errors, v2.ErrorCodeDigestInvalid.WithDetail(err))
})
}
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx.Errors = append(ctx.Errors, v2.ErrorCodeDigestInvalid.WithDetail(err))
})
}
blobHandler := &blobHandler{
Context: ctx,
Digest: dgst,
}
return handlers.MethodHandler{
"GET": http.HandlerFunc(blobHandler.GetBlob),
"HEAD": http.HandlerFunc(blobHandler.GetBlob),
"DELETE": http.HandlerFunc(blobHandler.DeleteBlob),
}
}
// blobHandler serves http blob requests.
type blobHandler struct {
*Context
Digest digest.Digest
}
// GetBlob fetches the binary data from backend storage returns it in the
// response.
func (bh *blobHandler) GetBlob(w http.ResponseWriter, r *http.Request) {
context.GetLogger(bh).Debug("GetBlob")
blobs := bh.Repository.Blobs(bh)
desc, err := blobs.Stat(bh, bh.Digest)
if err != nil {
if err == distribution.ErrBlobUnknown {
bh.Errors = append(bh.Errors, v2.ErrorCodeBlobUnknown.WithDetail(bh.Digest))
} else {
bh.Errors = append(bh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
}
return
}
if err := blobs.ServeBlob(bh, w, r, desc.Digest); err != nil {
context.GetLogger(bh).Debugf("unexpected error getting blob HTTP handler: %v", err)
bh.Errors = append(bh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
return
}
}
// DeleteBlob deletes a layer blob
func (bh *blobHandler) DeleteBlob(w http.ResponseWriter, r *http.Request) {
context.GetLogger(bh).Debug("DeleteBlob")
blobs := bh.Repository.Blobs(bh)
err := blobs.Delete(bh, bh.Digest)
if err != nil {
switch err {
case distribution.ErrBlobUnknown:
w.WriteHeader(http.StatusNotFound)
bh.Errors = append(bh.Errors, v2.ErrorCodeBlobUnknown)
case distribution.ErrUnsupported:
w.WriteHeader(http.StatusMethodNotAllowed)
bh.Errors = append(bh.Errors, v2.ErrorCodeUnsupported)
default:
bh.Errors = append(bh.Errors, errcode.ErrorCodeUnknown)
}
return
}
w.Header().Set("Content-Length", "0")
w.WriteHeader(http.StatusAccepted)
}